#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	ll D;
	cin >> D;
	ll ans = D;
	FOR(i, 1, 61) {
		ll l = 0, r = D;
		while (r - l > 1) {
			ll m = (l + r) >> 1;
			ll s = 0, cur = m;
			REP(j, i) {
				s += cur;
				if (s > D) break;
				cur >>= 1;
			}
			if (s >= D) r = m;
			else l = m;
			if (s == D) chmin(ans, r);
		}
	}
	cout << ans << endl;
}